Boiler mud ring structure



July 18, 1933. G, w 1,918,363

BOILER MUD RING STRUCTURE Filed D80. 23, 1931 A3 5 pqso 0 Q o @{0 Q oOOOOOOv L -FlG.3.- 24

0 9 0 0 0 0 o o o 0 1) 0 o o o INVENTOR George M Wilson,

JUT RNEY Patented July 18, a

enonenm. w ILson, dru mers, NEW Yonx 30mm m ;ms 1 screwing-i;

" Application fi1ed December 23,1931i Seriall No.f582,7l2. 1

This invention relates to steam boilers and particularly to the bottomring commonly called. the mud ring which holds the inner and outerfire-box sheets in spaced relation.

The objectf'ofsthe present invention is to' provide anv-improvedboilermud' ring structure, which will be characterized by strengthanddurability making for increased longev ity of service,relativelightness in weight,and being economical to construct, while atthe same time'being of sufiicient flexibility-"in combination with itsstre'ngthto meet all the requirements of service."

Mud rings of rectangular cross section'to which the fire-box sheets areattachedjby rivetspassed through thesheets and the ring,

, have been employed in common practice,and

i' cracks to formv between the rivet holes in the in recentconstructions the bottom edges of the sheetshave been welded to therings to increase the tightness of the joints. Prolonged service,however, frequently causes the rivets ofsuch structures to loosenand'cause mud ring and the sheets. 'The'necessary repairs, because ofthese defects, are costly in both time and labor. Such loosening andcracking especially when nearthe corners of the structure, if notproperly repaired, results in erosion of the scarred edges of the sheetsto the extent] of requiring their replacement sooner than wouldotherwise be necessary.

The present. invention a provides 1 a I structure" wherein the rivetsformerly employed for the attachment of the sheets tohthe rin areentirely jeliminatedtogether with the objectionable results causedthereby. -"This structure comprises a ring of considerably reducedweight, which ring is ,of ampl'em strength to withstand all of thestresses imposed upon it byreason of the boiler pressure on the insideand by reason'of the shocks and;

vibrations of the frame structure of the'locomotive, which are commonlymet with in everyday practice. Further, the structure is characterizedby a, certain flexibility enabling it to adjust itself to irregularexpanding and contracting movements of the boiler caused by differencesand changes in temperature.

Referring to the drawing, wherein there is illustrated a specificembodiment of'the present plug in position. I v i I i Referringindeta'il to thezdrawing the cut invention, and wherein like'freferencecharacters on the sev'eralfigures indicate like parts, Fig: 1 is ahorizontal'sectional view of' a partof the mud ring structure of theinstant invention, taken on the line I 1' of Fig. 2;

Fig.'-2 is a fragmentary section taken onthe line IIII ofFig: 1; Fig.3'is an'endview in elevation of a partofthe structure-illustrated'inFig. 1;Fig. t is' asection-on an en'- larged-scaleof the inud ring,taken onth e li'ne IV-IV ofFig. 3';and Fig.- 5. is a section on anenlarged "scale of the mud ring taken on the line V--Vjof Fig. 1 showingthe wash- 3 structure embodying the instant invention comprisesa closedrectangular mud ring 1, Q having a bottom portion 2, and: two up iwardly extendingouter and inner sidewalls, 3, and 4, respectivelyii vThering *is "thus "of hollow, upstandingu U-shaped construction.Theupwardly extending outer and inner side walls 3 and4,are ofreducedthickness at their lupper portions" 5. and 6 :providingledges 7and 8," anda plurality of threaded bolt holes.

9 arelformed in the upper portionso and 16 of the walls-aroundtheentirering, the holes of theouterwallbeing oppositely disposed with relationto or alignedwiththeholes. of: the

inner wall- The upperedges of the walls 5 are bevelledatoa and6a,.to1avoid thelodge- "ment of sediment thereon,whenlthe bOilOILlS inoperation, with theboilersheets assembled with theringashereinaftendescribed; I- Outer fire-boxsheets 1O -v extend upwardlyfrom. the, mud ringwith their lower, ends 7 "adjacent theoute'r'sidesiof the upper portion f the mud ring wall 3, and with theiredges v acentithe ledge 7, vso that the outer surfacesoftheinud ring ana thejouterfire-box! sheets are flush with eachother}. ASi-miIarIy,

inner.v fire-box; sheets -11 "extend upwardly fromathe, mud ring withtheir lower' ends adjacent the outer surfaceofthe upperpor:

tion} 6 .and (their -.lower edges adjacent the ledge 8 of the mudringwa'll 4, the outersurfaces of the inner fire-box sheet 11- beingflush with the outersurface ofthevmud'ring wall .4.) Bolt holes 12 areformed in the fire-box sheets opposite to i or in I alignment with theholes 9 in the mud ring andstaybolts are passed through the holes of thesheets and of the mud ring walls, and secure the sheets to the ring. Thestaybolts'l3 are threaded and engage the threaded bolt holes 9, and theextremities of the staybolts are headed over at the outer sides of thesheets. The lower edges of the sheets, adjacent the ledges? and 8 arewelded to the mud ring as indicated at 14, the weld deposit filling thespace therebetween and providing additional securing means between thesheets and the ring, and making for increased strength and tightness ofthe jointure. The fire-boxsheets are made 7 in sections in theusualmanner and overlap" at their meeting edges, and are riveted together inthe usual manner at such edges, as

- indicated at 15. Thebottom portion-of these connecting edges, however,are cut awayat .the portions where they would otherwise overlap,"asindicated at 16, so as to evenly meet and present a continuous evensurface at theiportion of the sheets connected with 1 the mud ring.Rivets 17- are provided at, the

corner portions of the sheet securing said portions ,to themud ring toassistithe corner staybolts, so as to strengthen the same, and

the adjacentedges ofthe sheets at the cut away. portionsare weldedasindicated at 18,

;to insure a sturdy and'steani-tight connection. By this means, the'jointure of the section of sheet of one side of the ring with thesection of sheet of adjacent side is accomplished. v r I j .The mud ringis provided with wash-out openings--19 atits corners. Thesopenings slantdownwardly andoutwardly from the i bottom-of the ring the outersurface-of the ring around the periphery of these. openings being-formed as a collar or-boss,:as indicated at :20 and'the interior of theopenings being threaded, as indicated at 21,1forthe reception ofwash-out plugs 22 which arecorrespondingly threaded at23 andyadaptedtobetightly screwed into said openings. By thus pro-,

viding thewa'sheout openings at the corners of the ring slantingdownwardly from the bottomthereof, as distinguishedr from the usualpractice wherethe openings are located parallel to the bottom of thering in the side thereof, an easiei ouhflow of water is pro- 'vid'ed'.integrally 'formed on thebottom' of the mud ring areverticalflanges 24provided with bolt holes 25 forattachingand supporting theboiler,-in'the usual 'manner, tovthe frame of the locomotive. r

1 By the foregoing construction will'be I seen that there is provided astructurelof sub-' stantially reduced weight, whichissufliciently'sturdy and embodies the character istic of flexibility,so as to enable it to adjust itself to irregular expansion andcontraction movements of the boiler due tov differences and changes intemperature, while at all times maintaining the oints steam-tight andwithstanding all stresses imposedupon them by reason of boilerpressurelbetween the sheets,

and the shocks and vibrations of the frame structure of the locomotivewhich .are common to everyday practice. The structure is furthercharacterized by its simplicity,

cost. e I

'VVhile there has been herein described a specific embodiment of theinstant invention easiness of assemblyfand' therelatively low it will beunderstood that many and various changes andfl modifications may be madethereto without departing from the spirit of theinvention, and that alland any such changes and modifications as falli withinthe scopeof theappended elaim are contemplated as a part of the present inventioir' IThe invention claimedand desired ,to be secured by Letters Patent is: IIn a locomotiveboiler,,the combination of a mud ring comprisingintegrally formed U- shaped members extending along opposite sides ofthe boiler fire box, each member havinga base and two spaced wallsunited with and extending upwardly from the base-providing therewith achannel open atethe'top,

said spaced walls eachhaving longitudinal f row of-spa'ced threadedorifices nearits upper edge, the orifices on one side being aligned withthe orifices on'the opposite'sideprovid' ing pairs, and. said membershaving thick"- ened portions on-each side begi-nningata point betweenthe row of'orificesand the bote, tom of saidcha'nnel and extending'belowthe bottom of said channel, to reinforcexthe union between saidbase andsaid walls, each of said thickened portions forming, a shoulder withthe-adjacent upwardlyextending pore tion of the wall; a boilerplateadjacent the eXterior-face'of each of said-upwardly ex tendingportions ,andfhaving perforations registering- With said. threadedorifices and ha'ving'a lower edge spaced above'the adjacent shoulder,said edge beingwelded toe-aid fl

